Diagonal stay



J. PETTY DIAGONAL STAY Filed Nov. 21. 1923 2 Sheets-Sheet 2 Patented Oct. 13, 1925.

UNITED STATES PATENT FFicE.

DIAGONAL STAY.

Application led November 21, 1923. Serial No. 676,199.

To @ZZ 107mm t may concern: v

Be it known that l, JOHN PETTY, a citizen of the United State/sof America, and resident of the city and county of Lebanon, in the State of Pennsylvania, have invented a certain new and useful Improvement in Diagonal Stays, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention relates to diagonal stays suoli as are used for connecting the heads and shells of cylindrical boilers. The object of my invention is to provide a diagonal stay for such uses, adapted to be secured to one and, preferably, to `both of the connected plates by means of rivet extensions adapted to extend through rivet holes formed in the plate or plates and, in iiiy preferred construction, having rivet extensions at both ends of the stay. l. form the rivet extension at the shell contacting end of the stay at an angle to the stay'which will pern mit it to be rocked into position in its rivet hole, after the rivet extension at the head contacting end of the stay is inserted in its rivet hole and, by preference, also, I

J, fornitherend of the shell rivet eXtensionat inserted in the rivet hole in the head at apoint which will correspond with the center of the rivet hole through which the angularly extending `rivet extension is to pass.

An advantage of my construction, which 1 is one of theobjects of my invention, is

that if a rivet extension is inserted in place in anappropriate rivet hole the stay can be rotated on said inserted rivet as a pivot for changing the angle which the stay forms with the plate inl which the rivet hole is located. This is particularly important with reference to `the rivet `extension from the boiler 'head contacting lend of the stay as it enables the boiler constructor to shift the point of attachment to the shell through a considerable arc with little or no `necessity for re-forming the contacting surface between the stay and the shell and this is also true, though in less degree, with regard to a construction in which the stay is obviously connected through its rivet extension with the shell of the boiler.

which illustrate my invention,

Figure l is a sectional elevation of one corner of a cylindrical boiler showing my improved stay in itspreferred form located `countersunk rivet hole in the shell.

Figure 5 is a cross section through the rivet extension on the line 5 5 of Fig. 4., and j Figure 6, a cross section on the line 6 6 of Fig. 4.

Figure 7 is a view of a somewhat modified construction ofthe rivet extension at the shell contacting end of the stay, showing` also the shell and shell rivet hole adapted for this 'modified construction.

v"'ligure 8 is a cross section Vof the rivet extension on the line 8 8 of Fig. 7, and

FigureQ, a crosssectio-n on the linei9-9 of Fig. 7. f

.55 Reference being had to the drawings Figure l0 is a view generally similar to Fig. l, but showing a modified construction of the stay in which a crow foot head is used to secure its shell contacting endto the shell.

Figure'v 11 is a fragmentary view illustrat ing the preferred crow foot construction of the sta-y shown in Fig. 10.

Figure 12 is again a view generally similar to that of Fig. l, but showing a modification' of the stay construction in which a crow foot head is provided at the headcontacting end of thestay, and

Figure 13 is a fragmentary View showing the preferred crow foot form.

A indicates the head of the boiler and B the shell. A indicates a rivet hole formed in the boiler head, preferably though not necessarily, countersunk, as indicated; B',

Fig. l, indicates the rivet hole extending through the shell B at an oblique angle. B2, Fig. t, indicates a rivet hole through the shell and countersunk formation. B3, Fig. 7, illustrates again another form of rivet hole through the shell adapted for the peculiar rivet extensions shown in said view, and B4, Fig. l2, indicates a rivet hole eX- tending through the shell B and adapted for use with the form of stay shown in this view. C indicates my improved diagonal stay which, by preference, is formed with heads C and C2 adapted to contact with the inside of the boiler head and boiler shell, as indicated. From the head C extends a rivet extension D adapted to extend through the rivet hole A in the head and to be riveted down on the outside of the head, as indicated in dotted lines at (l. E indicates a rivet extension from the shell cont-acting head C2 of the stay, which rivet extension is formed at an angle to the line ofthe stay which will enable it to be rocked into the rivet hole formed in the shell after the rivet extension D is inserted in the hole in the head. This rocking motion centers on the lower edge c of the head C', as indicated, by the radius line shown in dotted lines at H. By preference, I draw the end of the rivet E into a point, indicated at F, and so located that it will contact with the inner surface of the shell plate B at a point b which should correspond to the center of the rivet hole B and in using my improved stay it will be found convenient to form the rivet hole A in the head A, insert the rivet extension D in this hole and mark on the inside of the shell B the point b where the point F contacts with the shell. The rivet hole B can' then be formed with the point E as a, center. In the'construction shown in Figures 1, 2, and 3, the rivet. E is of circular cross sect-ion on the line 2 2, as indicated in Fig. 2, and of Velliptic cross section on the line 3 3, as indicated in Fig. 3, so as to enable the rivet E to make a fairly close fit in the rivet hole. 1

At Z and e I have indicated in dotted lines the formation of the rivets from the rivet extensions D and E.

In the modification shown in Figs. 4, 5, and 6, the rivet hole in the shell indicated at B2 is of circular form in any plane parallel to the line of the shell and inclined rivet eX- tension E is of elliptic cross section on the line 5 5, as indicated in Fig. `5, and of circular cross section on the line 6 6, as indicated in Fig. G, this enabling it to form a 1fairly close fit with the bottom of the rivet iole.

In the construction shown in Fig. 7, the rivet extension E2 `extends at right angles to the head C2, but has its outer face inclined so as to enable it to be rocked into position. In this construction the rivet hole indicated at B3 is shaped to it the face of the rivet extension which, on the line 8 8, is of elliptic form, as indicated in Fig. 8, while on the section line 9 9 it is of circular form, as indicated in Fig. 9.

In the modication illustrated in Figs. l0 and 11, the head contacting end of the stay is formed as in Fig. l, but attachment is made to the shell B by means of a crow foot head C3 and rivets G. The crow foot eX- tends in this construction transversely to the line of the stay so that the rivets G will be exposed to equal stresses which is not the case where the crow vfoot formation is such that the rivets lie one behind the ot-her. An advantage of my construction which is common to this modiiication as well as those ofl the other modifications illustrated is that the stay C can be rotated through a considerable arc on its rivet extension D before it is headed down without changing the angle of the stay wit-h reference to the plane of the boiler head, or materially changing the angle of the stay with reference to the boiler shell. This gives lmore latitude as to the point of attachment of the stay to the shell of the boiler and obviously the point of attachment to the shell can be varied through a quite considerable arc without requiring any or much adjustment of the head formation on the side which contacts with the shell.

In the modification illustrated in Figs. l2 and 1B, the stay is formed with a rivet extension E3 of the shell contacting head C2 which lits into a rivet hole B4 in the shell, while the head contacting end of the stay is formed with acrow foot head indicated at C* and it will be obvious that in this construction t-he stay can turn on its rivet extension. B4 as a pivot sol as. to provide for some liberty in the selection of the point of Contact of the lower end of the stay with a boiler head.

It will lhe understood that the constructions of Figures 1, 4 and 7 are preferred by me vbut that certain leading features of my invention are still preserved in such modifications as are illustrated in Figs. 10 and l2.

I-Iaving now described my invention, what I claim as new and desire -to secure by Letters Patent, is:

l. A diagonal. stay having at one end a head adapted to lie against one of the plates to be connected and a rivet extension projecting from said head and adapted to eX- tend into a rivet hole in the plate, said stay having at its other end mea-ns for securing it to the other plate to be connected.

2. A diagonal stay having at' one end a head adapted to lie against a boiler head and a. rivet extension projecting from said head and adapted to enter a rivet hole in the boiler head, said stay having at its other end means for attaching it to a plate of the boiler She-ll. l

3. A diagonal stay having a rivet eXtension at one end adapted to enter a rivet hole in a plate and a rivet extension art its' other end formed at an angle to the stay Which will permit it to be rocked into a rivet hole in the other plate after the rivet at its opposite end is inserted in its rivet hole.

4. A diagonal stay having heads at its ends adapted to Contact With the plates to be secured together, a. rivet extension Jfrom one head adapted to extend through a rivet ho-le in a contacting plate and a rivet eX- tension from the other head formed at an angle to the stay which will permit it to be rocked into a rivet hole in the other plate after the rivet at the opposite end is inserted in its rivet hole.

5. A diagonal stay adapted for use between a boiler head and shell, said stay having heads at its ends adapted to oontact with the boiler head and shell, a rivet extension from the boiler head contacting head of the stay adapted to extend into a rivet hole in the boiler head, a rivet extension from the Shell contacting head adapt ed to extend into a rivet hole in the shell and formed at an angle which Will enable it to be rocked into its rivet hole after the rive-t at the other end is inserted in its rivet hole, said rivet extension having its end drawn to a point so located as to Contact with the shell at a point corresponding to the center of the rivet hole to be formed in said shell.

JOHN PETTY. 

